linux-kernel - [PATCH net v2] rds: ib: Remove unused extern definition

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Message-ID: <20250904115345.3940851-1-haakon.bugge@oracle.com>
Date: Thu,  4 Sep 2025 13:53:43 +0200
From: Håkon Bugge <haakon.bugge@...cle.com>
To: Allison Henderson <allison.henderson@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>
Cc: stable@...r.kernel.org,
        Håkon Bugge <haakon.bugge@...cle.com>,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        rds-devel@....oracle.com, linux-kernel@...r.kernel.org
Subject: [PATCH net v2] rds: ib: Remove unused extern definition

In the old days, RDS used FMR (Fast Memory Registration) to register
IB MRs to be used by RDMA. A newer and better verbs based
registration/de-registration method called FRWR (Fast Registration
Work Request) was added to RDS by commit 1659185fb4d0 ("RDS: IB:
Support Fastreg MR (FRMR) memory registration mode") in 2016.

Detection and enablement of FRWR was done in commit 2cb2912d6563
("RDS: IB: add Fastreg MR (FRMR) detection support"). But said commit
added an extern bool prefer_frmr, which was not used by said commit -
nor used by later commits. Hence, remove it.

Fixes: 2cb2912d6563 ("RDS: IB: add Fastreg MR (FRMR) detection support")
Cc: stable@...r.kernel.org
Signed-off-by: Håkon Bugge <haakon.bugge@...cle.com>

---

	v1 -> v2:
	      * Added commit message
	      * Added Cc: stable@...r.kernel.org
---
 net/rds/ib_mr.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/net/rds/ib_mr.h b/net/rds/ib_mr.h
index ea5e9aee4959e..5884de8c6f45b 100644
--- a/net/rds/ib_mr.h
+++ b/net/rds/ib_mr.h
@@ -108,7 +108,6 @@ struct rds_ib_mr_pool {
 };
 
 extern struct workqueue_struct *rds_ib_mr_wq;
-extern bool prefer_frmr;
 
 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev,
 					     int npages);
-- 
2.43.5